You can try one other thing that we usually reserve for beatles, and some pipe smokers use it to clean out their pipes. Everclear. Completely wipe down the humidor with it. Then let dry for a day, then re-season, if the smell is still there, toss it. 190 proof is best, pure grain alchohol, but you can try 151 or less if that is the legal max amount in your state or country.